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Finding the Fourth Proportional to 399.87, 603.23 and 387.59

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Solution

The fourth proportional to 399.87, 603.23 and 387.59 is: 584.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.87 : 603.23 = 387.59 : x
  2. Step 2: Convert to fraction form
    399.87/603.23 = 387.59/x
  3. Step 3: Cross multiply
    399.87x = 603.23 × 387.59
  4. Step 4: Simplify right side
    399.87x = 233,800.96
  5. Step 5: Solve for x
    x = 233,800.96/399.87
  6. Step 6: Final answer
    x = 584.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.